Abstract
We have investigated the dimensionality and origin of the magnetotransport properties of films epitaxially grown on -terminated substrates. High-mobility conduction is observed at low deposition oxygen pressures () and has a three-dimensional character. However, at higher the conduction is dramatically suppressed and nonmetallic behavior appears. Experimental data strongly support an interpretation of these properties based on the creation of oxygen vacancies in the substrates during the growth of the layer. When grown on substrates at low , other oxides generate the same high mobility as films. This opens interesting prospects for all-oxide electronics.
- Received 18 January 2007
DOI:https://doi.org/10.1103/PhysRevLett.98.216803
©2007 American Physical Society